72741751731 has 32 divisors (see below), whose sum is σ = 123749932800. Its totient is φ = 41765595840.

The previous prime is 72741751727. The next prime is 72741751739. The reversal of 72741751731 is 13715714727.

It is not a de Polignac number, because 72741751731 - 2² = 72741751727 is a prime.

It is a super-2 number, since 2×72741751731² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72741751739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6439666 + ... + 6450951.

It is an arithmetic number, because the mean of its divisors is an integer number (3867185400).

Almost surely, 2^72741751731 is an apocalyptic number.

72741751731 is a deficient number, since it is larger than the sum of its proper divisors (51008181069).

72741751731 is a wasteful number, since it uses less digits than its factorization.

72741751731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12890656 (or 12890650 counting only the distinct ones).

The product of its digits is 288120, while the sum is 45.

The spelling of 72741751731 in words is "seventy-two billion, seven hundred forty-one million, seven hundred fifty-one thousand, seven hundred thirty-one".